Reversible throttle handle



Aug. 3 1926-.

F. A. JIMERSON REVERSIBLE THROTTLE HANDLE l Filed August '7 1925Patented Ang, 3,1926.

UNITED STATFQ MEN? g aries.

FRANCIS A. JIMERSON, OF ATHENS, PENNSYLVANIA., ASSIGNOR 'IOINGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, .A CORPORATION OFNEVI JlEI'tEY.v

REVERSLBLE THROTTLE HANDLE.

Application led .August 7, 1925.

This invention relates to fluid actuated rotary tools, such as rotarydrills and the like, but more particularly to a reversible throttlehandle for machines of this type.

Such rotary tools run at comparatively high speed, and a good example ofa tool of the general type to which the reversible throttle handle,forming the subject matter of this invention relates. is disclosed in mycopending application Serial No. 567,887, filed, June 13, 1922, forfluid actuated rotary tool showing the general organization of the partsof the tool itself.

In such high speed tools especially the manipulation of the throttleshould be posi tive and certain and the objects of this invention are toprovide such certainty of operation and at the same time, if desired,insure the automatic return of the valve to neutral position when thevalve is released. In some respects the invention is a modification andimprovement of the machine disclosed in my copending application SerialNo. 29,060, filed, May 9, 1925.

Further objects will hereinafter appear and the invention is shown inone of its preferred forms in the accompanying drawings in which,

Figure l is a longitudinal sectional elevation of a rotary drill havingthe invention applied thereto, with the throttle valve in the handleclosed,

Figure 2 is an enlarged detail transverse sectional view on the line 2-2of Figure l looking in the direction of the arrows, with the throttlevalve closed,

Figure 3 is an enlarged detail view partly in longitudinal section of aportion of the throttle handle in a plane at right angles to the planeof the section of Figure l, with the throttle valve open,

Figure 4 is a detail transverse sectional view taken on the line l-'e ofFigure l looking in the direction of the. arrows,

Figure 5 is a view of a portion of Figure 3 showing the valve cam inneutral position so that the throttle valve is closed as in Figure l,and

Figure 6 is -anenlarged detail transverse sectional view partly brokenaway and taken through the reversing valve of the machine on the line 66 of Figure l, looking` in the direction of the arrows, with thereversing valve open.

In the drawings, only so much of the de- Serial No. 48,869.

tails of the rotary drill are shown as vill serve to disclose thepresent invention relating to the reversible throttle handle. rl`hecase, or cylinder casing A, having the reI movable crank case cover Band the removable gear case or front head C together forni the trarne ofthe machine inclosing and supporting the operating part-sfor impartingrotation to a suitable tool, which be carried in the socket D providedin the drill spindle E.

rlthe drill is provided with the throttle handle body F and the oppositehandle G, and the pressure fluid is supplied to the machine through thehandle body F and controlled by the throttle valve L manipulated hyimproved devices in accordance with this invention, so that the valve,if desired, may always be made to return to neutral position whenreleased. Otherwise the valve is both opened and closed by hand.

The crank shaft H is mounted in the ball bearings J in the case Abeneath the crank cover B and adapted to be actuated by a fluid actuatedmotor of any suitable type, as for instance, a multi-cylinder motorhaving V-type arrangement of cylinders, two of the cylinders K beingindicated in Figure l. at one side of the machine, and 'at an angle tothe aXis, the remaining` pair of cylinders not being shown. rlhe pistonsO recipro eating in the cylindersare connected by connectingrods P tothe crank shaft and the distribution of motive liuid to the cylinders,in this instance, is controlled by a rotary valve Q actuated by suitablegearing from the cra-nk shaft.` Suitable ports Q in the casing for eachcylinder are controlled by the appropriate ports and passages in therevolving` valve Q, but the details of the passages leading to thecylinders and the details of the cycle of operations in admitting andexhausting pressure fluid to and from the cylinders are not furtherillustrated as they form no part of the present inventioin The crankshaft H is provided with a pinion R meshing with the gear S on thespindle' E and another gear T connected to a gear S drives the valve Qthrough the agency'of the pinion U, so that in the present instance thevalve is rotated at half the speed of the crank.

In order to feed the working tool forward, an internal feed'screw V ismounted in the case and is provided with an extension ,W

:IB Leonesa upon which is mounted a bearing X. A by turningthe handlesleeve d clockwise as =i`eed screw Y having a center Z and a hand Wheela, as usual, completes these parts o1".

the machine.

The machine is preferably provided with a reversing` valve o mounted inthe sleeve c in the case A in a convenient position .to be operativelyconnected to be actuated by the reversible throttle handle sleeve. (Zrotatable back and forth to a limited degree on the outside of thehandle body F, so that as the throttle valve L opens, the reversingvalve o is rotated in one direction or the olier 'trom closed positionto cause direct or reverse rotation oin the motor.

A heus L e embracing the handle body F andcovering the valve l) and thevalve stem y, is secured to the case A by means ot the screws g, andprotects 'the operative parts beneath it. ln vhis instance the housingalso acts as a abutment tor holding` thenvalve against endivise movementin one direction.-v A toothed sector g on the valve stem lengages atoothed .sector g2 of a handle cam IL. The cai/n 7L is in the toi'in ota sleeve movable on the body ll" and has a slot in the outer flange jengaged by the tongue /c on the handle sleeve (l, so that rotation etthe sleeve rotates the valve il stop pin `0 conveniently located in thecase A is pressed by a spring,` p and engages one of thedepressions r inthe inner flange 1" ot the handle cam 7L to hold the valve in one oranother of the valve positions, either closed or open.A The depressions7 and the stop pin- 0 may be omitted, it desired, thus permittingthevalve L to be closed automatically by the action ot' the spring t uponrelease of the handle sleeve CZ.

rlhe throttle valve L is movable longitudinally in the handlefbody F andnormally forced to `its closed position on the seat s by suitable coiledspring t. A slot u at the inner end ot' the valve stem o engages thevcross pin w movable in the slot c@ in the handle body and having`rollers y at each end cooperating With and forming the fol,- lovvers otthe handle cam L. This cam 7L hasthe `angular or if-shaped cam surfacese-'softhat when the-rollers y lie at the apen or-bottomot the l! -shapedcam opening, the parts are all in neutral position and both the throttle.valve L and the reversing valve Z) areclosed as shown in Figure l ofthedraw-ing. Rotation ot the handle sleeve cl in oner direction or theother causes the roll elle P1/ to ride up or outwardly on the camsurfaces .e to open the throttle valve, which may be Aautomaticallyreturned to closed or neutra-l position by the pressure ot the spring twhen the handle sleeve (Z is `released.

ln the operation of the device, let itbe assumed that the valves L and bare both closed as shown in Figure l and that pressure 'fluid isto beadmitted to the machine Figure l is viewed from the lett, to theposition ot' the parts in Figure 3. In such case the cam surfaces z Willhave moved the throttle valve Lto open position andjpressure fluidpasses through the open portion of the handle body F and passages 2 inthe body to the chamber 3 at the inner end ot' the hany dle body, andJtroni thence as indicated in higure G, through passage 6 in the case,to and through thebushing c and reversing` valve Z; to the passage 6 inthe case, and through the distributing valve Q. to the motor cylinders.he exhaust from the cylinders passes out troni the distributingvalve Qto the passage 7 in the case and 'troni thence through the reversingvalve b to the atmospheric exhaust port S. Upon reversing the movementotthe handle sleeve (l, which muet lirst pass through neutral position,the throttle L is closed and then opened again and reversing valve b isreversed, in which case the 'functions of the passages 6a and 7 in thecase is reversed, and the supply ot presre fluid passes to thedistributing` valve and motor cylinders through the passage 7, While thepassage 6a becomes anvezthaust passage.

l claim:

l. ln a luid actuated rota-ry biiwtion vith a case and motor, of ahandley bcc a rotatable handle sleeve, a throttle` valve in the handlebody, a housing secured to the casing and encircling thehandle body, arotatable reversing` valve adjacent the handle body, a stein on saidreversing valve and abuting the housing to hold the valve againstendivise movement in one direction, a handle cam rotatable on toe valvebody, and operative connections in the housing for transmitting rotarymovement otA lthe handle cam to the reversing valve.

2. In a fluid actuated rotary drill, the combination with a case andmotor, ot a handlei body, a .rotatablefvhandle sleeve, a throttle valvein thehandlebody,a housing secured tothe casingand encircling the handlebody, a rotatable reversing valve adjacent the handle body, astem onsaid-reversing valve and abutting the housing to hold the valve againstendwise `movement in one direction, a handle cani rotatable on the valvebody and.` extending into the housing, a toothed sector integral withthe handle'cam enclosed by the housing, and a toothed sector on the stemot the valve to engage the toothed sector on the handle cam: tortransmitting rotary movement ot' the handle sleeve to thereversingvalve.

ln testimony -Whereot l have signed' this specilication.

FRANCIS at. ,EMERSON drill, they com-

